Improved plumbing tool



FIG. 1 is a side, elevational view of an improved plumbing tool showing my new design;

FIG. 2 is a top, plan view thereof;

FIG. 3 is a bottom, plan view thereof;

FIG. 4 is a front, elevational view thereof; and

FIG. 5 is a rear, elevational view of FIG. 1. 

The ornamental design for an improved plumbing tool, as shown and described. 